Optical data medium containing; in the information layer, a dye as a light-absorbing compound

a technology of light-absorbing compound and information layer, which is applied in the field of optical data medium containing, can solve the problems of reducing the desired layer thickness, adversely affecting the reflectivity, and affecting the reflectivity

Inactive Publication Date: 2004-12-23
LANXESS DEUTDCHLAND GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The amorphous layer of light-absorbing substances should preferably have a high heat distortion resistance, since otherwise further layers of organic or inorganic material which are applied by sputtering or vapour deposition to the light-absorbing information layer will form ill-defined interfaces through diffusion and thus adversely affect the reflectivity.
In addition, light-absorbing substances having too low a heat distortion resistance at the interface with a polymeric substrate can diffuse into the latter and once again adversely affect the reflectivity.
If a light-absorbing substance has a too high vapour pressure, said substance can sublime during the abovementioned sputtering or vapour deposition of further layers in a high vacuum and hence reduce the desired layer thickness.
This in turn leads to an adverse effect on the reflectivity.

Method used

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  • Optical data medium containing; in the information layer, a dye as a light-absorbing compound
  • Optical data medium containing; in the information layer, a dye as a light-absorbing compound
  • Optical data medium containing; in the information layer, a dye as a light-absorbing compound

Examples

Experimental program
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example 1

Radiation-Curable Resin and its Application

[0356] Surface Coating

[0357] 100 parts by weight of Roskydal.RTM. UA VP LS 2308 (an aliphatic urethane acrylate in an 80% concentration in hexanediol diacrylate, based on a hexamethylene diiso-cyanate trimer having a viscosity of 34 pa.s at 23.degree. C. from Bayer A G, Leverkusen, Germany), 40 parts by weight of isobornyl acrylate (IBOA from UCB GmbH, Kerpen, Germany), 3 parts by weight of Irgacure.RTM. 184 (alpha-hydroxyacetophenone, a Norrish Type I Photoinitiator from Ciba Spezialititenchemie GmbH, Lampertheim, Germany) and 0.9 parts by weight of Byk.RTM. 306 (a levelling additive from Byk-Chemie GmbH, Wesel, Germany) are mixed intimately with each other and adjusted with butyl acetate to a dynamic viscosity of 500 mPa.s at 23.degree. C.

[0358] Application: spin-coating conditions will be referred to in the respective examples

[0359] Curing: After flashing off the solvent (for 60 mins at room temperature or 30 mins at 60.degree. C.) the c...

example 2

[0360] 56

[0361] The dye dichloro-silicon-phthalocyanine (SiCl.sub.2Pc) was applied for the information layer. The disc structure employed was as shown in FIG. 2.

[0362] The polycarbonate substrate was molded by injection method to form a groove structure of 0.32 .mu.m pitch and the depth of 20 nm. Directly on top of the grooved surface the information layer of 40 nm was coated by vacuum vapor deposition method of the dye. A UV curable resin, according to example 1, was then applied by spin coating at 800 rmp rotation speed and cured by UV-light on the incident beam side of the medium to form the cover layer. Total thickness of the cured cover layer was set as 100 .mu.m. Other UV-curable resins can be used in the same way.

[0363] The parameters of readout / recording setup was as follows (please confirm by Sony):

[0364] Wavelength of the laser=405 nm

[0365] Numerical aperture of the objective lens=0.85, two element lens

[0366] Readout laser power=0.40 mW

[0367] Writing laser power=7.0 mW

[036...

examples 3-23

[0375]

1 (MeX.sub.1X.sub.2)PcR.sup.3R.sup.4R.sup.5R.sup.6 Nr. Me X.sub.1 X.sub.2 R.sup.3 R.sup.4 R.sup.5 R.sup.6 3 Al Cl -- -- -- -- -- 3a Si O--C.sub.6H.sub.5 -- -- -- -- -- 4 Al O--C.sub.6H.sub.5 -- -- -- -- -- 5 Zn -- -- -- -- -- -- 6 V .dbd.O -- -- -- -- -- 7 Ga Cl -- -- -- -- -- 8 In Cl -- -- -- -- -- 9 Ge Cl Cl -- -- -- -- 9a Ge Br Br -- -- -- --10 Si OCH.sub.2CH.sub.3 OCH.sub.2CH.sub.3 -- -- -- --11 Si CH.sub.3 Cl -- -- -- --12 Si Phenyl Cl -- -- -- -- 13 Si CH.sub.3 OCH.sub.2CH.sub.3 -- -- -- --14 Si Osi(CH.sub.3).sub.3 Osi(CH.sub.3).sub.3 -- -- -- --15 Si Cl Cl C(CH.sub.3).sub.3 C(CH.sub.3).sub.3 -- --16 Si Cl Cl C(CH.sub.3).sub.3 C(CH.sub.3).sub.3 C(CH.sub.3).sub.3 C(CH.sub.3).sub.3 17 Al Cl -- C(CH.sub.3).sub.3 C(CH.sub.3).sub.3 C(CH.sub.3).sub.3 C(CH.sub.3).sub.3 18 Al OH -- -- -- -- --19 Al Cl --Si(CH.sub.3).sub.3 Si(CH.sub.3).sub.3 Si(CH.sub.3).sub.3 Si(CH.sub.3).sub.3 20 Ti OSi(CH.sub.3).sub.3 OSi(CH.sub.3).sub.3 -- -- -- --21 Sn OSi(CH.sub.3).sub.3 OSi(CH.sub.3).sub.3...

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Abstract

Optical data medium containing in the information layer, a dye as a light-absorbing compound Abstract optical data medium containing a preferably transparent substrate which is optionally already coated with one or more barrier layers and on the surface of which an information layer which can be recorded on using light, optionally one or more barrier layers, and a cover layer containing a radiation-cured resin, have been applied, which data medium can he recorded on and read using focused blue light through the cover layer on the information layer, preferably laser light with the wavelength between 360 nm and 460 nm, the information layer containing a light-absorbing characterized in that at least one dye is used as the light-absorbing compound wherein the cover layer dies have a total thickness of 10 mum 177 m and the numerical aperture NA of the focusing objective lens setup is greater or equal 0.8.

Description

PRIOR ART[0001] The invention relates to a, preferably singly recordable, optical data medium which contains, in the information layer, at least one dye as a light-absorbing compound, and has a defined thickness of all the cover layers and can be recorded and readout with a focusing optical setup with a defined numerical aperture and a process for its production.[0002] The singly recordable optical data media using special light-absorbing substances or mixtures thereof are suitable in particular for use in the case of high-density recordable optical data media which operate with blue laser diodes, in particular GaN or SHG laser diodes (360-460 nm) and / or for use in the case of DVD-R or CD-R discs which operate with red (635-660 nm) or infrared (760-830 nm) laser diodes, and the application of the abovementioned dyes to a polymer substrate, made from for example polycarbonates, copolycarbonates, polycycloolefines, polyolefines, by spin-coating, vapour deposition or sputtering.[0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C09B44/10G11B7/244C09B47/08C09B67/02G11B7/0045G11B7/007G11B7/135G11B7/24G11B7/247G11B7/2475G11B7/248G11B7/2492G11B7/2542G11B7/257G11B7/26
CPCC09B44/10C09B47/085C09B67/0097G11B7/00455G11B7/007G11B7/00718G11B7/24G11B7/247G11B7/2475G11B7/248G11B7/2492G11B7/2542G11B7/26G11B2007/2571G11B2007/25713
Inventor BERNETH, HORSTBRUDER, FRIEDRICH-KARLSABI, YUICHIYAMAMOTO, MASANOBUHAESE, WILFRIEDHASSENRUCK, KARINKOSTROMINE, SERGUEILANDENBERGER, PETERSOMMERMANN, THOMASSTAWITZ, JOSEF-WALTERHAGEN, RAINEROSER, RAFAELKRUGER, CHRISTA-MARIAMEYER-FRIEDRICHSEN, TIMOTAMADA, SAKUYA
Owner LANXESS DEUTDCHLAND GMBH
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